Originally Posted by eno439
1 Long, 3 Short Beeps.
You've probably just added memory to the motherboard since this is a conventional or extended memory failure. Generally this is caused by a memory chip that is not seated properly. Reseat the memory chips.
source - http://forums.pureoverclock.com/showthread.php?t=3935
In my experience, 1 long beep following by 3 short ones means there's a problem with the graphics card. It could be seating on the slot, the slot itself or the actual graphics card. Best way to test is to try another slot or better, another graphics card that you know to be working.
Still, try reseating all the RAM. If not, try with only one stick of RAM. I'm pretty sure you're right in blaming the graphics card, though. I'd suggest what was suggested earlier - remove the heatsink from the graphics card and make sure that all the spacers are there so that metal screws are not touching the PCB and these can short-circuit the graphics card.